American Sign Language: "proof"

To do this sign correctly you have to smack your dominant hand down onto your
non-dominant hand. The motion is so fast and forceful that the dominant hand
bounces back up a bit.

PROOF:

Memory aid: Think of your dominant hand as representing some sort of
document or picture that proves you are "right." Throw the picture onto the
table in front of you as if confronting someone with the "proof" of whatever it
is you are trying to prove.

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